# Sportsmobile Promaster RB 113s

Promaster RB 113s is a class b floor plan by Sportsmobile.

## Specs (2026 model year)

| Spec | Value |
| --- | --- |
| Length | 17 ft 9 in |
| Sleeps | 2 |

## Model years

2026. Year-specific specs: `https://rvenvy.com/class-b-motorhomes/sportsmobile/promaster/rb-113s?year={year}`

## Overview

The Sportsmobile Promaster RB 113s stands out for its obsessive approach to insulation: cork underlayment underfoot, wool lining on the walls, doors, and ceiling, radiant barrier foil throughout, and magnetic arctic panels for the windshield and doors mean this van handles temperature extremes far better than most Class Bs. The galley is genuinely functional, with a Norcold 12V refrigerator, pull-out faucet sink, 10-gallon fresh water tank, and city water hookup, while a 3,000-watt true sine inverter with Bluetooth monitoring and a solar MPPT controller keep the 200Ah AGM battery system topped up off-grid. Seating converts to sleeping using steel roller tracks, with options ranging from a dinette that slides into a Queen bed to a gaucho or couch arrangement, all in a Ram ProMaster chassis that owners consistently praise for its low step-in height and tight turning radius in tight spaces. The full bath rounds out a surprisingly complete package for an 18-foot van.

## Inventory

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Floor plan diagram: https://images.rvenvy.com/77cae02f18f8c8cdcdbc0e01a14a96c2746f3d00bb875ffe6b8f14386e21ceba/1024.webp

Canonical page: https://rvenvy.com/class-b-motorhomes/sportsmobile/promaster/rb-113s